Study on Hydrological Conditions of the Design of Sewage-carrying Capacity Verification in Coastal Pollutant Discharge Areas
In order to scientifically and reasonably determine the allowable heavy metal emissions in the planned sewage discharge area of the coastal area,lead is taken as an example to calculate the lead environmental capacity by numerical model.Based on the large-scale offshore model,taking into account the high and low water periods of rivers entering the sea and the large,medium,and small tidal ranges studied in the sea area,four hydrological scenarios were set up.There are 10%frequency spring difference of typical abundant water process superimposed in the sea area,10%frequency spring difference of typical flat water process superimposed in the sea area,50%frequency medium tidal range of typical low water process superimposed in the sea area,and 90%frequency low tidal range of typical low water process superimposed in the sea area.In general,the smaller the runoff volume near the pollution discharge area and the farther away from the estuary,the less affected it is by the flood and depletion process of the river entering the sea,and the greater the tidal range.The adverse tidal patterns can be taken as the key research object in the calculation of the water environment capacity of the coastal area.The hydrological parameters of the river entering the sea can be appropriately considered in combination with the actual planning and management needs of the sewage discharge area.
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